EP 0782544 B1 20010829 - METHOD FOR PURIFYING SODIUM ALUMINATE SOLUTIONS CONTAINING SODIUM OXALATE
Title (en)
METHOD FOR PURIFYING SODIUM ALUMINATE SOLUTIONS CONTAINING SODIUM OXALATE
Title (de)
FLÜSSIGE REINIGUNGSZUSAMMENSETZUNG
Title (fr)
PROCEDE D'EPURATION DES SOLUTIONS D'ALUMINATE DE SODIUM CONTENANT DE L'OXALATE DE SODIUM
Publication
Application
Priority
- FR 9601104 W 19960716
- FR 9509040 A 19950720
Abstract (en)
[origin: US5888461A] Process of sodium oxalate purification of sodium aluminate solutions resulting from alkaline attack of bauxites according to the Bayer process, comprising: precipitation of said sodium oxalate in at least a fraction of the pre-decomposed sodium aluminate solution, by means of an agent that destabilizes the supersaturation state of the sodium oxalate, or deoxalation initiator, separation of the oxalate, precipitated with the destabilizing agent in the form of an insoluble residue, and the purified sodium aluminate solution which is then recycled as the leaching liquor, characterized in that the destabilizing agent or deoxalation initiator, placed in contact with the sodium aluminate solution, is a salt other than an oxalate, a metal oxide, a metal hydroxide, or a mixture thereof, said destabilizing agent remaining insoluble and chemically inert with respect to the reaction medium, and in that, after regeneration if any, it is recycled to the top of the process as the deoxalation initiator.
IPC 1-7
IPC 8 full level
C01F 7/473 (2022.01)
CPC (source: EP US)
C01F 7/473 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FR GR IE IT
DOCDB simple family (publication)
US 5888461 A 19990330; AU 6617996 A 19970218; AU 700993 B2 19990114; BR 9606529 A 19971014; CA 2199059 A1 19970206; CA 2199059 C 20081014; DE 69614818 D1 20011004; DE 69614818 T2 20020404; EP 0782544 A1 19970709; EP 0782544 B1 20010829; ES 2161369 T3 20011201; FR 2736908 A1 19970124; FR 2736908 B1 19970829; HU 220533 B1 20020328; HU P9702302 A2 19980828; HU P9702302 A3 19981228; OA 10405 A 20011205; WO 9703924 A1 19970206
DOCDB simple family (application)
US 68596096 A 19960722; AU 6617996 A 19960716; BR 9606529 A 19960716; CA 2199059 A 19960716; DE 69614818 T 19960716; EP 96925792 A 19960716; ES 96925792 T 19960716; FR 9509040 A 19950720; FR 9601104 W 19960716; HU P9702302 A 19960716; OA 60976 A 19970319